This experiment was created by the students in my LING432 The Psychology of Language class (Summer 2009) at the University of Arizona. The students analyzed the data from this experiment (from the first 20 participants anyway) for their final papers. I am now using this experiment to demonstrate a version of DMDX that allows for remote testing.
The experiment can be run on desktop PCs, laptop PCs, or even on a Mac as long as you have booted Windows.
The task is lexical decision (see below for instructions). A "Yes" response requires the RIGHT CTRL key to be pressed, and a "No" response requires the LEFT CTRL key. The spacebar gets you through direction screens.
All you need to do is click on the link below. Then click on "Save File" to download the experiment file ("ListB"). Double-click on "ListB" in your Downloads list, and then follow the prompts to begin the experiment. When you get to the end, press the spacebar, and the results will be sent to me automatically .
You can abort the session at any time by pressing the ESC key.
One final point: The experiment won't run if you are running something in the background that might pop a window up.
Instructions for the Experiment
This is an experiment that measures how quickly people can read words. You will be shown a string of UPPER case letters on the computer screen, and your task is to decide whether they form a word or not. If the letter string forms a word (e.g., SOLDIER), press the RIGHT CTRL key; if it does not form a word (e.g., FLINKETS), press the LEFT CTRL key. None of the words in the experiment are unusual or rare.
The first thing you will see is a row of “#########” signs, which is a warning that a letter string is about to follow. After that, you will see a letter string in UPPER case letters. You will indicate whether or not the letter string is a word using the CTRL keys.
After each response, you will be shown how long it took you to respond (in milliseconds, so 500 means half a second) and whether or not your response was correct.
You should try to make your responses as quickly as possible, but also as accurately as you can. If you notice that you are making a lot of errors, you may want to slow down a little.
There are some practice items at the beginning of the experiment. Once the experiment is underway, each new item will be presented automatically. After about twenty items, the display will stop, so you can rest if you want to. To continue the experiment, press the spacebar.
Click here to download the experiment.